The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 25, 2025
Filed:
Feb. 22, 2022
Assa Abloy Ab, Stockholm, SE;
Frans Lundberg, Saltsjöbaden, SE;
ASSA ABLOY AB, Stockholm, SE;
Abstract
It is provided a method for providing a privacy-enhanced delegated access right to unlock a physical lock. The method comprises: obtaining a derivation scalar; receiving a cryptographically signed delegation from the delegator device, the delegation being a data object comprising a public key of the delegator device, a public key of the physical lock, and a derived public key for the delegatee device, and wherein the delegation is cryptographically signed using a secret key that is paired with the public key of the delegator device; obtaining a source secret key for the delegatee device, the source secret key being paired with the source public key; calculating a derived secret key for the delegatee device using the source secret key for the delegatee device and the derivation scalar; providing the delegation to the physical lock; and authenticating the delegatee device with the physical lock using the derived secret key.